I have downloaded some dem files from the USGS site and I am trying to create a surface from that data. I can create a surface based on the dem, but it is extremely small. I don't think that it is using the correct coordinates for some reason. The dem is a rather large area, but in c3d it less than .1" across. Can anyone give some help as to how to get the surface to be the correct size? Thanks, RJ.